Teenager Jelena Ostapenko advanced to the semifinals of the French Open by rallying past former No. 1 Caroline Wozniacki, 4-6 6-2 6-2.

Ostapenko is the first woman from Latvia to make it to a Grand Slam semifinal in the professional era. At age 19, the 47th-ranked Ostapenko is also the youngest player in the tournament.

As she often has since the start of the tournament, Ostapenko took many risks, hitting 38 winners to make up for her 50 unforced errors on court Suzanne Lenglen.

That dangerous approach paid dividends as she hit a crosscourt forehand winner then a backhand down the line to break for 5-2 in the decider. She served out the match at love.

The last teenager to advance to the semifinals at Roland Garros was Ana Ivanovic 10 years ago.

Meanwhile Timea Bacsinszky will celebrate her 28th birthday by also playing in the semifinals after a straight-set victory over home favourite Kristina Mladenovic.

Bacsinszky beat 13th-seeded Mladenovic 6-4 6-4 in a match which was twice delayed by rain.

Mladenovic appeared to deal better with the initial delay. She fought off break point to hold at the start of the second set and then immediately broke.

But Bacsinszky broke back. The Swiss player then won 12 of the 15 points before rain started falling again.

Bacsinszky almost dropped her serve but held on and won the match when Mladenovic hit a forehand wide.

The No. 30 seed will next face Ostapenko, who also celebrates her birthday on Thursday.

Due to the weather Australians Casey Dellacqua and Ashleigh Barty had their women’s doubles quarter-final moved to Wednesday.

The rain also postponed until Wednesday the quarterfinals involving Rafael Nadal versus Pablo Carreno Busta and Novak Djokovic versus Dominic Thiem..

Nadal is a nine-time champion at Roland Garros. Djokovic is the defending champion. If they both win their quarterfinals, they would meet in a semifinal showdown.